Getting Back Up There

So I had a few thin sites with competition so low I was able to rank on the first page with one simple exact match anchor pr3 directory link. However, the site was hit after a month.

Probably because the link was from a public paid directory and/or the site was very thin. Who knows.

Anyway I want to re-make the site under a different domain with more pages.

My question is just:

1) Can someone recommend me a place to buy a very cheap pr 2-3 link that wont get hit by google? That isnt from some gay directory. I know theres resources here but I am not really sure what constitutes a "good" link and I dont need anything fancy.

2) While I was able to rank with only one pr 3 exact keyword match directory link, and would be again (comp is just super low). I dont want to be buried in a month again. Should I be buying at least 3 links, and/or doing some blog commenting, or something, so I dont have a 100% exact match anchor ratio because I only had 1 backlink? Aka to avoid getting hit again?

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